Using modulo to loop through lists

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I made the mistake of looking at some python the other day and I noticed that they were using the modulo to loop through a list.  As in if there was a list of four items, the loop would contain something like 

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items[x%4]

.  So that being said, what's throwing me for a loop, is that I can see how that works once 'x' becomes >= than 4, but i am stumped for when x would equal 0 to 3.  Would that not be 0/4, 1/4, 2/4, and 3/4?  I understand that 0/4 would have a remainder of 0, but then, to me at least, 1/4 through 3/4 would not have a whole number remainder.  So how would 'items[1%4]' give you the second item in the list?  To me, the remainder of 1 divided by 4 is not equal to 1.  It's 0.25.  If I actually type out 1%4 in my prompt, it does return 1, so apparently the computer agrees with it.